Proposal to address lamp positioning on wider vehicles of categories R, S, and T, to allow using reflective materials as an alternative to retro-reflectors, to clarify provisions (including failure detection), and to make editorial improvements.

Proposal to address vehicles of categories R or T with a width more than 2.55 m and of category S with a width more than 3 m as well as to allow using reflective materials as an alternative to retro-reflectors.